Marking instrument



FIG. 1 is a top front perspective view of a marking instrument showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

FIGS. 2 through 7 have been drawn to a reduced scale with respect to FIG. 1. 

The ornamental design for a marking instrument, as shown and described. 